Description of the security update for SharePoint Server 2019: September 10, 2019

This security update resolves a remote code execution vulnerability that exists in Microsoft SharePoint if the software does not check the source markup of an application package. To learn more about this vulnerability, see the following CVE descriptions: 

• Microsoft Common Vulnerabilities and Exposures CVE-2019-1257
• Microsoft Common Vulnerabilities and Exposures CVE-2019-1260
• Microsoft Common Vulnerabilities and Exposures CVE-2019-1261
• Microsoft Common Vulnerabilities and Exposures CVE-2019-1295
• Microsoft Common Vulnerabilities and Exposures CVE-2019-1296

Note To apply this security update, you must have the release version of Microsoft SharePoint Server 2019 installed on the computer.

This security update contains improvements and fixes for the following nonsecurity issues:

• When file paths on file shares are longer than the default Windows supported path length (260 characters), files are crawled without access control list (ACL) information.

• Installing a SharePoint Server 2019 solution on a multi-server farm is an unreliable process and will not necessartily succeed.

• When you attach a content database from a previous version of SharePoint Server to SharePoint Server 2019, existing "Table of Contents" web parts in that database would always have the "Show content from starting location" setting enabled after the upgrade. This update fixes this issue by preserving the original setting during upgrade.

• Through the client-side object model (CSOM), the TaskLink ProjUid property for an external task returns the ID of its own project instead of the ID of the project that the task refers to. This update adds the ExternalProjectUid and ExternalTaskUid properties to the Task class to fix this issue.

• Loading a timesheet is very slow and may take one minute or more.

• Project Server Interface (PSI) API calls that require the permission of a farm administrator fail for users who are farm administrators but not server administrators.